Export csv file, compare to other csv file, and create csv file with changes

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Posted on by md7

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Hi all,

I have been tasked to find a way to compare two reports (one from the current month, one from the previous month), find any changes and then create a excel file with those changes on.

My data is in dataverse and exports monthly using a flow so I always have a monthly back up.

Is there a way of doing this? There's about 60-70 columns in the csv files.

Thanks!

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takolota1 4,890 Super User 2025 Season 1 on at

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Export csv file, compare to other csv file, and create csv file with changes

It is possible to efficiently get your CSV data from both files into JSON arrays with something like...
https://community.powerplatform.com/galleries/gallery-posts/?postid=189733b3-bea9-41b3-bc01-ec0fa209005d

Then once both the CSVs are in JSON arrays you can use a series of intersect( ) expressions, union( ) expressions, & Filter array actions along with primary keys to identify the rows with changes.
This build contains an example of such a set-up...
https://community.powerplatform.com/galleries/gallery-posts/?postid=e1e47e8f-9bfd-4d9c-9b43-68ced3a6cbfb

From there you can get both the new version of the row from the new CSV & the old version of the row from the preceding CSV.
Robby_WW 115 on at

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Export csv file, compare to other csv file, and create csv file with changes

Hi,

There is a way to compare 2 .csv files but it will take a very long time on big datasets.

I'm afraid there's no real good way of doing this.

Creating a new .csv file is not possible, i believe.